glapi: Add xml infrastructure for ARB_query_buffer_object
mesa: Add ARB_query_buffer_object extension flag
mesa: Add QueryBuffer to context

Add QueryBuffer and initialise it to NullBufferObj
on start
mesa: Handle QUERY_BUFFER_BINDING in GetIntegerv
mesa: Handle QUERY_RESULT_NO_WAIT in GetQueryObject{ui64}v

Just return and do nothing if query result is not yet available
mesa: Fix typos in function names in queryobj
mesa: Implement SaveQueryBuffer in software driver
mesa: Enable GL_ARB_query_buffer_object for software drivers
doc: mark GL_ARB_query_buffer_object as done